According to Bentley's you have it backwards. Its the 12y through '72 and
the 9y for 73-76. The engine number would appear right for a 72.
I may be wrong, but something in the back of my mind tells me that the lower
numbers are hotter plugs, but I may be wrong about that. I looked around on
the web for some reference on the numbers, but couldn't find anything. The
number is definitely the heat range. See
http://www.pittauto.com/champion_model.shtml
I have used both in my 69 and prefer the 12y plug, but objectively speaking
I think there is little performance difference between the two.
Jim Altman jaltman@altlaw.com Illigitimi non Carborundum
http://www.altlaw.com/metro/jaltman.html 69-TR6#CC28754L(O) W4UCK
-----Original Message-----
From: owner-triumphs@autox.team.net
[mailto:owner-triumphs@autox.team.net]On Behalf Of Michael Cline
Sent: Thursday, September 16, 1999 1:52 PM
To: triumphs@autox.team.net
Subject: What spark plugs in my TR6
My TR6 is a 1971 with a non original engine. The engine serial number is
CC82348UE. (I think the CC engines are early and the CF engines are later.)
The ROM specs 9YC for the early engines and 12YC for the later ones. VB
sells only one plug for all years. My question is what spark plug do I use?
What is the difference between the 9 and 12? What are the engine performance
differences?
Thanks,
Michael Cline
71 TR6, 73 Stag, 81 TR7
mcline@substrates.com
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